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This article will explain in detail how to use the commit mirrored in docker. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Docker commit: means to submit a copy of the container to make it a new mirror. Suppose we run a Tomcat container in docker, we make some custom changes in the tomcat container, and then we commit the modified tomcat container, so we form a new custom image.

Command format: docker commit-m = "submitted description information"-a = "author" container id target image name to be created: [signature]

Case demonstration

1. Download the tomcat image from hub and run it successfully.

Description:-p is a designated port,-P is a random port

[root@t-docker chenzx] # docker images tomcatREPOSITORY TAG IMAGE ID CREATED SIZEtomcat latest 690cb3b9c7d1 7 days ago 463MB [root@t-docker chenzx] # docker run-it-p 8888purl 8080 tomcatUsing CATALINA_BASE: / usr/local/tomcatUsing CATALINA_HOME: / usr/local/tomcatUsing CATALINA_TMPDIR: / usr/local/tomcat/ TempUsing JRE_HOME: / docker-java-home/jre30-Aug-2018 08 ajp-nio-8009 37 ajp-nio-8009 01.728 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"] 30-Aug-2018 08v 37 v 01.736 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"] 30-Aug-2018 08 v v 37 30-Aug-2018 01.739 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 555 ms [root@t-docker chenzx] # docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES5c83a1f3aea4 tomcat "catalina.sh run" 8 minutes ago Up 8 minutes 0.0.0.015 8888-> 8080/tcp quirky_ zhukovsky [root @ t-docker chenzx] # docker run-it-P tomcat [root @ t-docker chenzx] # docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES54a817e3ce05 tomcat "catalina.sh run" 21 seconds ago Up 19 seconds 0.0.0.0purl 32768-> 8080/tcp confident_leavitt

2. Intentionally delete the tomcat container document generated by the previous step image

[root@t-docker chenzx] # docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES54a817e3ce05 tomcat "catalina.sh run" 17 minutes ago Up 17 minutes 0.0.0.015 32768-> 8080/tcp confident_ oot@t-docker chenzx [r oot@t-docker chenzx] # docker exec-it 54a817e3ce05 / bin/bashroot @ 54a817e3ce05:/usr/local/tomcat# cd webapps/root@54a817e3ce05:/usr/local/tomcat/webapps# ls-ltotal 4drwxr examplesdrwxr-x--- examplesdrwxr-x----3 root root 306 Aug 23 00:47 ROOTdrwxr-x--- 14 root root 4096 Aug 23 00:47 docsdrwxr-x--- 6 root root 83 Aug 23 00:47 examplesdrwxr-x--- 5 root root 87 Aug 23 00:47 host-managerdrwxr-x--- 5 root root 103 Aug 23 00:47 managerroot@54a817e3ce05:/usr/local / tomcat/webapps# rm-rf docs/root@54a817e3ce05:/usr/local/tomcat/webapps# ls-ltotal 0drwxr Aug Aug 3 root root 306 Aug 23 00:47 ROOTdrwxr-x--- 6 root root 83 Aug 23 00:47 examplesdrwxr-x--- 5 root root 87 Aug 23 00:47 host-managerdrwxr-x--- 5 root root 103 Aug 23 00:47 manager

3. Through the previous step, the current Tomcat running instance is a container with no document content doc directory, which is used as a template to commit a new image of tomcat without doc, chenzx/tomcat02,chenzx is its own namespace.

[root@t-docker chenzx] # docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES54a817e3ce05 tomcat "catalina.sh run" 26 minutes ago Up 26 minutes 0.0.0.015 32768-> 8080/tcp confident_leavitt [root@t-docker chenzx] # docker commit-axiaoxin' -m='del tomcat docs' 54a817e3ce05 chenzx/tomcat02:1.2sha256:24c3d89d4d043e4fb97f0cf4f3b94bcf96b5600a062fc8de4e39a7763d20badf [root@t-docker chenzx] # docker imagesREPOSITORY TAG IMAGE ID CREATED SIZEchenzx/tomcat02 1.2 24c3d89d4d04 7 seconds ago 463MBtomcat latest 690cb3b9c7d1 7 days ago 463MB

4. Delete all running containers

[root@t-docker chenzx] # docker rm-f $(docker ps-Q) 54a817e3ce05 [root@t-docker chenzx] # docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

5. Generate a new container with our custom image

[root@t-docker chenzx] # docker imagesREPOSITORY TAG IMAGE ID CREATED SIZEchenzx/tomcat02 1.2 24c3d89d4d04 6 minutes ago 463MBtomcat latest 690cb3b9c7d1 7 days ago 463MBcentos latest 5182e96772bf 3 weeks ago 200MB [root@t- Docker chenzx] # [root@t-docker chenzx] # docker run-it-P chenzx/tomcat02:1.2 [root@t-docker chenzx] # docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESc6c68b224e84 chenzx/tomcat02:1.2 "catalina.sh run" 24 seconds ago Up 24 seconds 0.0.0.0 docker run 32770-> 8080/tcp awesome_sammet

As you can see, we use a custom jtomcat1.2 image, and there is no doc directory in the generated container

6. Start our new image and compare it with the original image

Start chenzx/tomcat1.2, which does not have a docs directory

Start the original tomcat. It has a docs directory

7. Start the tomcat container in a guardian mode (- d parameter)

[root@t-docker chenzx] # docker run-d-p 6666 tomcat23b4ec6f24b854f682631c5a9b6bcfc0c685dbec46d1867faea4b534f5791452 [root@t-docker chenzx] # docker psCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES23b4ec6f24b8 tomcat "catalina.sh run" 5 seconds ago Up 4 seconds 0.0.0.0 tomcat23b4ec6f24b854f682631c5a9b6bcfc0c685dbec46d1867faea4b534f5791452 6666-> 8080/tcp flamboyant_ This is the end of almeida's article on "how to use mirrored commit in docker". Hope that the above content can be helpful to you, so that you can learn more knowledge, if you think the article is good, please share it for more people to see.

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